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b=pGm7LyuTT3jnvoicPL7v5e+q3UDe4aTYTaqEt/K2i3tlXoFFIdiI4G3M7cJf4pVHJGZeyYwfD2qdjM+P/s3mHpCdKYOle2UkpTAaEp+OTKz9mODO0bQeFumSNsJkImpdwsqmiJmAhxcFZIAJVNdg6fwiN6p1dgClJMBw1srX/XE= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from SA0PR12MB4557.namprd12.prod.outlook.com (2603:10b6:806:9d::10) by MW4PR12MB6827.namprd12.prod.outlook.com (2603:10b6:303:20b::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9891.15; Fri, 8 May 2026 20:33:27 +0000 Received: from SA0PR12MB4557.namprd12.prod.outlook.com ([fe80::885a:79b3:8288:287]) by SA0PR12MB4557.namprd12.prod.outlook.com ([fe80::885a:79b3:8288:287%5]) with mapi id 15.20.9891.019; Fri, 8 May 2026 20:33:27 +0000 Message-ID: Date: Fri, 8 May 2026 15:33:24 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] CPU running at fixed frequency (~1.7 GHz) with kernel 7.1-rc1 Content-Language: en-US To: =?UTF-8?B?VmlrdG9yIErDpGdlcnNrw7xwcGVy?= Cc: linux-pm@vger.kernel.org, regressions@lists.linux.dev, Huang Rui , Thorsten Leemhuis References: <14a87c99-785c-4b16-bfce-35ecbf053448@freenet.de> <8654f7a1-5023-4874-a90a-5332ba6301b3@freenet.de> <33a693a8-a460-49b7-83cb-1ab7b66ce69e@freenet.de> <46eaec7d-a359-40c8-9c5c-57ecc3506805@leemhuis.info> <8c39f42a-f024-4f05-8d77-a95e7ca1c702@amd.com> <5fa4c763-bf94-4507-8667-f3dcb032b2e0@freenet.de> <399597ae-5186-4276-a585-acb1fd8155ad@amd.com> From: Mario Limonciello In-Reply-To: Content-Type: text/plain; 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but that would a fine surprise if so. >>>>>>> >>>>>> >>>>>> This patch series fixes the bug when I boot with "amd_dynamic_epp=disable" (I built >>>>>> the kernel with CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP=y). I didn't bisect to find out >>>>>> which patch contains the partial fix, but I can do this if it helps. >>>>>> >>>>>> If you need further information (acpidump and/or output from amd-pstate tool), just >>>>>> tell me. >>>>> >>>>> When you have dynamic EPP enabled it sets up platform profile.  With that series in place does changing platform profile help? >>>> >>>> Strangely *changing* the power profile (to any value) seems to enable the expected >>>> boosting behaviour, but since I can only do that when the PC has finished booting, >>>> the cores still seem to be stuck at ~1.7 GHz until then. Unless I am doing something >>>> stupid, that's not how it's supposed to work, I guess? > > Correction: Only changing the profile to "power-saver" leads to the expected behaviour, > switching between "balanced" and "performance" even several times in a row doesn't > help. Can you clarify what you mean specifically by expected behavior and incorrect behavior with this patch series? > >>> >>> Can you confirm your tree when you found this? >>> 7.1-rc2 + Prateek's series? >> >> Yes, exactly this. >> >>> >>> I would say that is not expected behavior; but it does hint further at the second bug.  Hopefully I can repro it. >>> >>>> >>>>>> Last week I got this output after applying a debugging patch from you: >>>>>>>> On 4/29/26 20:34, Viktor Jägersküpper wrote: >>>>>>>>> Am 29.04.26 um 19:14 schrieb Mario Limonciello: >>>>>>>>>> >>>>>>>>>> OK thanks.  Here is a debugging patch that should show what's happening in the new paths from e30ca6dd5345c5b8ba05f346a8e81105352fe571 so we can confirm root cause on your system. >>>>>>>>> >>>>>>>>> These are the dmesg lines concerning amd-pstate: >>>>>>>>> [    0.845044] amd_pstate: amd_pstate: CPU 0: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.845047] amd_pstate: amd_pstate: CPU 0: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.845059] amd_pstate: amd_pstate: CPU 0: platform_profile_register succeeded >>>>>>>>> [    0.845060] amd_pstate: amd_pstate: CPU 0: registering power supply notifier >>>>>>>>> [    0.849046] amd_pstate: amd_pstate: CPU 1: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.849047] amd_pstate: amd_pstate: CPU 1: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.849058] amd_pstate: amd_pstate: CPU 1: platform_profile_register succeeded >>>>>>>>> [    0.849059] amd_pstate: amd_pstate: CPU 1: registering power supply notifier >>>>>>>>> [    0.853043] amd_pstate: amd_pstate: CPU 2: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.853044] amd_pstate: amd_pstate: CPU 2: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.853054] amd_pstate: amd_pstate: CPU 2: platform_profile_register succeeded >>>>>>>>> [    0.853054] amd_pstate: amd_pstate: CPU 2: registering power supply notifier >>>>>>>>> [    0.857043] amd_pstate: amd_pstate: CPU 3: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.857044] amd_pstate: amd_pstate: CPU 3: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.857054] amd_pstate: amd_pstate: CPU 3: platform_profile_register succeeded >>>>>>>>> [    0.857054] amd_pstate: amd_pstate: CPU 3: registering power supply notifier >>>>>>>>> [    0.861045] amd_pstate: amd_pstate: CPU 4: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.861046] amd_pstate: amd_pstate: CPU 4: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.861056] amd_pstate: amd_pstate: CPU 4: platform_profile_register succeeded >>>>>>>>> [    0.861057] amd_pstate: amd_pstate: CPU 4: registering power supply notifier >>>>>>>>> [    0.865044] amd_pstate: amd_pstate: CPU 5: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.865046] amd_pstate: amd_pstate: CPU 5: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.865057] amd_pstate: amd_pstate: CPU 5: platform_profile_register succeeded >>>>>>>>> [    0.865058] amd_pstate: amd_pstate: CPU 5: registering power supply notifier >>>>>>>>> [    0.870044] amd_pstate: amd_pstate: CPU 6: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.870046] amd_pstate: amd_pstate: CPU 6: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.870058] amd_pstate: amd_pstate: CPU 6: platform_profile_register succeeded >>>>>>>>> [    0.870058] amd_pstate: amd_pstate: CPU 6: registering power supply notifier >>>>>>>>> [    0.874044] amd_pstate: amd_pstate: CPU 7: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.874045] amd_pstate: amd_pstate: CPU 7: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.874056] amd_pstate: amd_pstate: CPU 7: platform_profile_register succeeded >>>>>>>>> [    0.874057] amd_pstate: amd_pstate: CPU 7: registering power supply notifier >>>>>>>>> [    0.878045] amd_pstate: amd_pstate: CPU 8: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.878046] amd_pstate: amd_pstate: CPU 8: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.878055] amd_pstate: amd_pstate: CPU 8: platform_profile_register succeeded >>>>>>>>> [    0.878056] amd_pstate: amd_pstate: CPU 8: registering power supply notifier >>>>>>>>> [    0.882045] amd_pstate: amd_pstate: CPU 9: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.882046] amd_pstate: amd_pstate: CPU 9: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.882055] amd_pstate: amd_pstate: CPU 9: platform_profile_register succeeded >>>>>>>>> [    0.882056] amd_pstate: amd_pstate: CPU 9: registering power supply notifier >>>>>>>>> [    0.886045] amd_pstate: amd_pstate: CPU 10: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.886046] amd_pstate: amd_pstate: CPU 10: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.886055] amd_pstate: amd_pstate: CPU 10: platform_profile_register succeeded >>>>>>>>> [    0.886056] amd_pstate: amd_pstate: CPU 10: registering power supply notifier >>>>>>>>> [    0.890045] amd_pstate: amd_pstate: CPU 11: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.890046] amd_pstate: amd_pstate: CPU 11: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.890056] amd_pstate: amd_pstate: CPU 11: platform_profile_register succeeded >>>>>>>>> [    0.890056] amd_pstate: amd_pstate: CPU 11: registering power supply notifier >>>>>>>>> [    0.894046] amd_pstate: amd_pstate: CPU 12: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.894047] amd_pstate: amd_pstate: CPU 12: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.894056] amd_pstate: amd_pstate: CPU 12: platform_profile_register succeeded >>>>>>>>> [    0.894057] amd_pstate: amd_pstate: CPU 12: registering power supply notifier >>>>>>>>> [    0.898046] amd_pstate: amd_pstate: CPU 13: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.898047] amd_pstate: amd_pstate: CPU 13: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.898055] amd_pstate: amd_pstate: CPU 13: platform_profile_register succeeded >>>>>>>>> [    0.898056] amd_pstate: amd_pstate: CPU 13: registering power supply notifier >>>>>>>>> [    0.902046] amd_pstate: amd_pstate: CPU 14: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.902048] amd_pstate: amd_pstate: CPU 14: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.902059] amd_pstate: amd_pstate: CPU 14: platform_profile_register succeeded >>>>>>>>> [    0.902059] amd_pstate: amd_pstate: CPU 14: registering power supply notifier >>>>>>>>> [    0.906046] amd_pstate: amd_pstate: CPU 15: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.906048] amd_pstate: amd_pstate: CPU 15: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.906060] amd_pstate: amd_pstate: CPU 15: platform_profile_register succeeded >>>>>>>>> [    0.906060] amd_pstate: amd_pstate: CPU 15: registering power supply notifier >>>>>>>>> [    0.910046] amd_pstate: amd_pstate: CPU 16: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.910048] amd_pstate: amd_pstate: CPU 16: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.910058] amd_pstate: amd_pstate: CPU 16: platform_profile_register succeeded >>>>>>>>> [    0.910059] amd_pstate: amd_pstate: CPU 16: registering power supply notifier >>>>>>>>> [    0.914047] amd_pstate: amd_pstate: CPU 17: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.914048] amd_pstate: amd_pstate: CPU 17: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.914059] amd_pstate: amd_pstate: CPU 17: platform_profile_register succeeded >>>>>>>>> [    0.914060] amd_pstate: amd_pstate: CPU 17: registering power supply notifier >>>>>>>>> [    0.918049] amd_pstate: amd_pstate: CPU 18: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.918051] amd_pstate: amd_pstate: CPU 18: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.918081] amd_pstate: amd_pstate: CPU 18: platform_profile_register succeeded >>>>>>>>> [    0.918082] amd_pstate: amd_pstate: CPU 18: registering power supply notifier >>>>>>>>> [    0.922049] amd_pstate: amd_pstate: CPU 19: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.922051] amd_pstate: amd_pstate: CPU 19: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.922070] amd_pstate: amd_pstate: CPU 19: platform_profile_register succeeded >>>>>>>>> [    0.922071] amd_pstate: amd_pstate: CPU 19: registering power supply notifier >>>>>>>>> [    0.926049] amd_pstate: amd_pstate: CPU 20: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.926052] amd_pstate: amd_pstate: CPU 20: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.926073] amd_pstate: amd_pstate: CPU 20: platform_profile_register succeeded >>>>>>>>> [    0.926074] amd_pstate: amd_pstate: CPU 20: registering power supply notifier >>>>>>>>> [    0.930049] amd_pstate: amd_pstate: CPU 21: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.930052] amd_pstate: amd_pstate: CPU 21: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.930071] amd_pstate: amd_pstate: CPU 21: platform_profile_register succeeded >>>>>>>>> [    0.930072] amd_pstate: amd_pstate: CPU 21: registering power supply notifier >>>>>>>>> [    0.934050] amd_pstate: amd_pstate: CPU 22: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.934052] amd_pstate: amd_pstate: CPU 22: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.934072] amd_pstate: amd_pstate: CPU 22: platform_profile_register succeeded >>>>>>>>> [    0.934073] amd_pstate: amd_pstate: CPU 22: registering power supply notifier >>>>>>>>> [    0.938050] amd_pstate: amd_pstate: CPU 23: calling amd_pstate_set_dynamic_epp (current_profile=3) >>>>>>>>> [    0.938052] amd_pstate: amd_pstate: CPU 23: get_balanced_epp: power_supply_is_system_supplied=1, returning EPP=0x0 (ac=0x0, dc=0x80) >>>>>>>>> [    0.938073] amd_pstate: amd_pstate: CPU 23: platform_profile_register succeeded >>>>>>>>> [    0.938074] amd_pstate: amd_pstate: CPU 23: registering power supply notifier >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >